I’m just trying to get this clear op, are you saying that your DH admitted to going to see (older, larger) prostitutes when you were dating, but before you were married, in order to help him with a premature ejaculation problem?
You believed that story and were ok with it, supposedly, perhaps because you didn’t have sex until you got married???
And to this day your DH doesn’t want you to touch his penis because it’s ‘too sensitive’?
There is so much here to unpack even before we get to the porn sites. You were incredibly naive, but perhaps you were sexually inexperienced, and so just accepted this story he told you.
Your DH clearly has a dysfunctional relationship with sex, he has a fetish for much older and larger ladies and he has paid for those experiences in real life. Your own marital sex life sounds a bit odd if you can’t touch your DH, he seems to have some issues there. I think finding out about the porn has probably just brought some issues that are clearly there to the surface. Watching porn occasionally isn’t a big deal imho, paying for it is another matter, previous prostitute use is a big issue. I think you need to communicate open and honestly with him as obviously this bothers you and there are underlying unresolved issues.